The situation changed when Sir Tim Berners-Lee, learning of SGML from co-worker Anders Berglund and others at CERN, used SGML syntax to create HTML.

The usual ( default ) SGML concrete syntax resembles this example, which is the default HTML concrete syntax:

Microformats represent unofficial attempts to extend HTML syntax to create machine-readable semantic markup about objects such as retail stores and items for sale.

These often feature user-programmable syntax highlighting, and coding tools or keyboard macros similar to an HTML editor ( see below ).

This set is defined in the HTML 4. 0 DTD, which also establishes the syntax ( allowable sequences of characters ) that can produce a valid HTML document.

Finally, the encoding can be declared via the HTML syntax.

Most wiki software uses a special syntax, known as wiki markup, for users to format the text, instead of requiring them to enter in HTML.

When linking to PDF documents from an HTML page the " attribute name " can be replaced with syntax that references a page number or another element of the PDF, for example, page = – "# page = 386 ".

Netscape Navigator supported a feature called " JavaScript entities " or " script macros " by which script code could be included in HTML attribute values, using a syntax similar to that of character entity references.

The HTML 4. 01 specification reserves a syntax for the " future support of script macros " in HTML attributes, but they have not been incorporated into later standards and are not supported by any current browser.

The HTML syntax validity checker displays a smiley face in the Status Bar and also, optionally, in the Toolbar.

Text ( source ) editors intended for use with HTML usually provide syntax highlighting.

HTML syntax highlighting

Some text editors can also export the color markup in a format that is suitable for printing or for importing into word-processing or other kinds of text-formatting software ; for instance an HTML, colorized LaTeX, PostScript or RTF version of its syntax highlighting.

In addition to the Javadoc syntax, Doxygen supports the documentation tags used in the Qt toolkit and can generate output in HyperText Markup Language ( HTML ) as well as in Microsoft Compiled HTML Help ( CHM ), Rich Text Format ( RTF ), Portable Document Format ( PDF ), LaTeX, PostScript or man pages.

CFML tag syntax is similar to HTML element syntax.

In Web development, " tag soup " refers to formatted markup written for a web page that is very much like HTML but does not consist of correct HTML syntax and document structure.

Because web browsers have historically treated HTML syntax or structural errors leniently, there has been little pressure for web developers to follow published standards, and therefore there is a need for all browser implementations be able to treat what looks like HTML as " tag soup ", accepting and correcting for invalid syntax and structure.

The application includes a built-in HTML validator, which uploads pages to the W3C's HTML Validator and checks for compliance.

The Markup Validation Service is a validator by the World Wide Web Consortium ( W3C ) that allows Internet users to check HTML and XHTML documents for well-formed markup.

It was developed to be a more intuitive version of the first online HTML validator written by Dan Connolly and Mark Gaither, which was announced on July 13, 1994.

While the W3C and other HTML and XHTML validators will assess pages coded in those formats, a separate validator like the W3C CSS validator is needed to confirm that there are no errors in the associated Cascading Style Sheet.

Try to use more than one HTML validator or spider simulator because each tests, highlights, and reports on slightly different aspects of your website.

Probably the ultimate development of graphic presentations was the Dynamic page implementation of the University of Southern California BBS ( USCBBS ) by Susan Biddlecomb, which predated the implementation of the HTML Dynamic web page.

HTML (< u > H </ u > yper < u > t </ u > ext < u > M </ u > arkup < u > L </ u > anguage ) has been in use since 1991, but HTML 4. 0 ( December 1997 ) was the first standardized version where international characters were given reasonably complete treatment.

A simple Internet search finds millions of sequences in HTML pages for which the algorithm to replace an ampersand by the corresponding character entity reference was probably applied repeatedly.

The first publicly available description of HTML was a document called " HTML Tags ", first mentioned on the Internet by Berners-Lee in late 1991.

It was formally defined as such by the Internet Engineering Task Force ( IETF ) with the mid-1993 publication of the first proposal for an HTML specification: " Hypertext Markup Language ( HTML )" Internet-Draft by Berners-Lee and Dan Connolly, which included an SGML Document Type Definition to define the grammar.

HTML 4. 01 was published in late 1999, with further errata published through 2001.

; November 24, 1995: HTML 2. 0 was published as IETF RFC 1866.

; January 1997: HTML 3. 2 was published as a W3C Recommendation.

It was the first version developed and standardized exclusively by the W3C, as the IETF had closed its HTML Working Group in September 1996.

A markup for mathematical formulas similar to that in HTML was not standardized until 14 months later in MathML.

; December 1997: HTML 4. 0 was published as a W3C Recommendation.

; April 1998: HTML 4. 0 was reissued with minor edits without incrementing the version number.

; December 1999: HTML 4. 01 was published as a W3C Recommendation.

; May 2000: ISO / IEC 15445: 2000 (" ISO HTML ", based on HTML 4. 01 Strict ) was published as an ISO / IEC international standard.

; October 1991: HTML Tags, an informal CERN document listing eighteen HTML tags, was first mentioned in public.

It was replaced by a second version one month later, followed by six further drafts published by IETF itself that finally led to HTML 2. 0 in RFC1866

; November 1993: HTML + was published by the IETF as an Internet-Draft and was a competing proposal to the Hypertext Markup Language draft.

; April 1995 ( authored March 1995 ): HTML 3. 0 was proposed as a standard to the IETF, but the proposal expired five months later without further action.

The response from the server was always an HTML page.